<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>fenlan</title>
    <style>
        textarea{
            width: 300px;
            height: 300px;
            background-color: cyan;
            column-count:5; 
            resize:horizontal;
        }
    </style>
</head>
<body>
    <textarea name="" id="" cols="30" rows="10"></textarea>
</body>
</html>